Ingeniería Mecánica

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Subject: search.filters.subject.FRACCIÓN VOLUMÉTRICA

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    Optimización (Doe-Mezclas) del material híbrido con refuerzos de fibra de abacá, fibra de cabuya y fibra de vidrio de matriz de resina poliéster y su incidencia sobre las propiedades mecánicas a flexión, tracción e impacto
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2020-08) Chiluiza Toapanta, William Patricio; Paredes Salinas, Juan Gilberto
    It posed develop this investigation with the purpose of avoid ignorance in the design of Experiments with mixtures, this is applied to the Mechanical Engineering in the field of composite materials to be able optimize and determinate the best characteristics of the material. The method applied is the design of experiments with mixtures (DOE) the compound of fiberglass, Abaca and Cabuya with the matrix resin polyester applied for the simplexlattice design to determine the optimum mix. It determined a total of ten treatments, and each one forms the one hundred percent of the compound is formed, of which were made 150 specimens to tensile, flexion and impact test with the application of the standards of the ASTM 3039, ASTM 7264 and ASTM 5628 respectively. The results were analyzed to comply the assumptions of normality, equality of variance and waste independence otherwise the data were transformed to adjust the data to BoxCox. The previously analyzed data is passed to Minitab to optimize and determine the best volumetric fraction, finding a percentage of 20.07 for fiberglass, while natural fibers have a percentage of 4.85 percent for Abaca and Cabuya fiber of 5.08 percent. In addition, with the 70 percent Polyester Resin as constant this completes 100 percent of the material composite mix. With this combination it gets better mechanical properties to Traction, Flexion and Impact.
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    Estudio de las propiedades mecánicas de la lámina para pista atlética a partir de caucho reciclado utilizando poliuretano
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2020) LLerena Pico, Diego Andrés; Lascano Moreta, Alejandra Marlene
    In the research project, the analysis of the mechanical properties at different volumetric configurations of a composite material that is constituted by a polyurethane matrix and reinforced with recycled rubber particles was carried out, this in order to achieve a material that has excellent characteristics for the manufacture of sheets of athletic tracks, replacing the usual manufacturing materials with composites at low cost and friendly with the environment. The work proposed the preparation of a composite material with polyurethane and rubber granules at different volumetric fractions ranging from 70 percent polyurethane-30 percent rubber particles, 60 percent polyurethane-40 percent particles of rubber, 50 percent polyurethane-50 percent rubber particles, with a rubber particle size of 0.05 mm-1 mm, where the molds and probes used in the tests were made with the dimensional characteristics established in the ASTM standard, which will be used for ASTM D3039-2015 traction, ASTM D695 compression and ASTM D2240-15 hardness. The obtaining of optimal values was obtained to achieve the mechanical properties necessary for the realization of the composite material, where the volumetric fraction that has the best mechanical characteristics is that of 70 percent polyurethane-30 percent of rubber particles, with a maximum effort to tensile of 12.28 MPa, modulus of tensile elasticity of 282.69 MPa, elongation of 8.08 percent, maximum compressive stress of 28.4 MPa, creep stress 23 MPa, deformation of 37, 11 percent, modulus of elasticity to compression of 76.51 MPa and Shore D hardness 72.75
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    Obtención y caracterización de materiales compuestos de fibra de vidrio más resina poliester con inclusión de nanotubos de carbono mediante arco eléctrico
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Carrera de Ingeniería Mecánica, 2018) Salazar Chuquiana, Byron Ricardo; Paredes Salinas, Juan Gilberto
    This research is based on the mechanical characterization of composite epoxy matrix reinforced with carbon nanotubes, different configurations of the reinforcing material and volume fraction to determine the configuration and volume fraction to provide best combination of mechanical properties were taken to then it is compared to traditional materials and thus find a new alternative for a new composite material (carbon nanotubes - polyester composite resin + 3 layers of fiberglass).. Mechanical characterization for tensile tests, bending, hardness and volume fraction best configuration and an adhesion test between fiber and matrix was performed were performed. The tests performed were based on standards of strength (ASTM D3039 / D3039M-00), bending (ASTM D7264 / D7264M - 07 ASTM D 2240-00). Mechanical determination and relevant analysis determined that the material that best behavior present in combination in mechanical properties (Traction - Deflection) was the material composed of 5% of material obtained from carbon nanotubes with 65% matrix and 30% reinforcing and laminated in the following order of reinforcing layers [FV + (RP + NTC) + FV + (RP + NTC) + FV + (RP + NTC)], I improved the maximum tensile stress by 7.8% with respect to the original material and the maximum effort at bending remained within the expected standard deviation at a confidence level of 95%.
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    Estudio de las propiedades mecánicas (resistencia última a la tracción, límite de fluencia, dureza, resistencia al impacto) de la aleación aluminio 1060 con magnesio obtenido mediante el proceso de pulvimetalurgia
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Carrera de Ingeniería Mecánica, 2018) Carrera Ramos, Diego Salvador; López Villacís, Gonzalo Eduardo
    The experimental work was based on the study of the basic mechanical properties (ultimate tensile strength, yield strength, hardness, impact resistance) of aluminum alloy 1060 with magnesium in its different volumetric fractions, the approach of the study arises from the appearance of new materials that are used in the construction of mechanical elements that are part of vehicles and other means of transport, with properties equal or superior to those of traditional materials, being replaced by some of its advantages among which we have its reduced weight and low cost, the alloyed material was subjected to traction hardness and impact analysis obtaining the final results of each of the tests. For the execution of the tests the ASTM standards that regulate the execution of the tests were used, thus the following norms were used: (ASTM E8-00b, ASTM E10-01 Hardness, ASTM E23-01 Impact), this way they executed the analyzes and it was possible to establish the volumetric fraction that presented the best results. With the results obtained it was determined that the groups with the best mechanical characteristics are the Y1 group for tensile tests and the Y2 group for hardness and impact tests presenting the following average properties, ultimate tensile strength: 53.19 MPa, limit creep: 7.29 MPa, hardness: 41.98 HB, impact resistance: 1.12 J / cm2.
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    Caracterización de las propiedades mecánicas del material híbrido utilizando matriz epóxica reforzada con tejido de fibra vegetal de algodón y fibra natural de abacá
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Carrera de Ingeniería Mecánica, 2017) Benavides Salinas, Geovanny Santiago; Paredes Salinas, Juan Gilberto
    This experimental research is based on the characterization of the hybrid material of epoxy matrix reinforced with layers of structured woven of abaca fibers and cotton in different orientations and with varied volumetric fractions, the purpose of the study is to obtain the best characterization of the material containing the best mechanical properties. In this work the stratification process was used for compression to obtain the hybrid material, it was to establish the definitive percentage volumetric fractions of reinforcements, material thickness and number of layers of reinforcement of woven. Of all the characterizations made determined group of specimens that exhibits the best mechanical properties tests standardized under the ASTM standards. (ASTM D3039-00 traction, flexion ASTM D7264-07 and impact ASTM D5628-10). The analysis of three types of trials determined that the hybrid material presented better mechanical properties corresponds to the case 3 which has a volumetric fraction of 75% resin Epoxy (matrix), 18.25% abaca fiber and 6.75 percent cotton (reinforcements).